diff --git a/Tun/Punchnet/Actors/SDLContextActor.swift b/Tun/Punchnet/Actors/SDLContextActor.swift
index 0a81e71..fc05cc9 100644
--- a/Tun/Punchnet/Actors/SDLContextActor.swift
+++ b/Tun/Punchnet/Actors/SDLContextActor.swift
@@ -165,7 +165,9 @@ actor SDLContextActor {
         await quicClient.start()
         
         defer {
-            self.quicClient = nil
+            if self.quicClient === quicClient {
+                self.quicClient = nil
+            }
             SDLLogger.log("[SDLContext] startSuperClient defer")
         }
         
@@ -492,8 +494,11 @@ actor SDLContextActor {
         self.dnsMonitorTask?.cancel()
         self.dnsLocalMonitorTask?.cancel()
         
+        let quicClient = self.quicClient
+        self.quicClient = nil
         self.superMonitorTask?.cancel()
-        self.udpHoleMonitorTask?.cancel()
+        self.superMonitorTask = nil
+        await quicClient?.stop()
 
         self.readTask?.cancel()
         self.readTask = nil
diff --git a/Tun/Punchnet/Actors/SDLQuicClient.swift b/Tun/Punchnet/Actors/SDLQuicClient.swift
index d860bde..2c40c42 100644
--- a/Tun/Punchnet/Actors/SDLQuicClient.swift
+++ b/Tun/Punchnet/Actors/SDLQuicClient.swift
@@ -44,7 +44,6 @@ actor SDLQUICClient {
     private var readTask: Task<Void, Never>?
 
     private var connection: NWConnection?
-    private let queue = DispatchQueue(label: "com.sdl.QUICClient.queue") // 专用队列保证线程安全
     
     private let host: String
     private let port: UInt16
@@ -58,6 +57,9 @@ actor SDLQUICClient {
     }
     
     func start() {
+        let host = self.host
+        let queue = DispatchQueue(label: "com.sdl.QUICClient.queue") // 专用队列保证线程安全
+
         let options = NWProtocolTLS.Options()
         sec_protocol_options_add_tls_application_protocol(
             options.securityProtocolOptions,
@@ -67,11 +69,11 @@ actor SDLQUICClient {
         // 这里设置证书的校验逻辑
         sec_protocol_options_set_verify_block(
             options.securityProtocolOptions,
-            { metadata, trust, complete in
+            { _, trust, complete in
                 // 执行公钥校验
-                complete(TLSVerifier.verify(trust: trust, host: self.host))
+                complete(TLSVerifier.verify(trust: trust, host: host))
             },
-            self.queue
+            queue
         )
         SDLLogger.log("[SDLQUICClient] start with tls protocol", for: .debug)
         
@@ -87,7 +89,7 @@ actor SDLQUICClient {
                 await self?.handleConnectionState(state: state)
             }
         }
-        connection.start(queue: self.queue)
+        connection.start(queue: queue)
         
         self.connection = connection
     }
@@ -190,7 +192,13 @@ actor SDLQUICClient {
         self.state = .stopped
         
         self.readTask?.cancel()
-        self.connection?.cancel()
+        self.readTask = nil
+
+        let connection = self.connection
+        self.connection = nil
+        connection?.stateUpdateHandler = nil
+        connection?.cancel()
+
         self.finishMessageContinuationIfNeed(throwing: nil)
         
         SDLLogger.log("[SDLQUICClient] stopped")